How to know the file type

Hi
I am doing some operation in which files will be dumped in Specific location.

I want to know the File type.i.e i am expecting CSV files.

So i want to write a script so that i can check the file which are dumped are in CSV Files.xxxx.csv format.

Try the 'file' command, although this won't differentiate between a CSV file and a plain text file

file {filename}